palaeotropics
/ˌpalɪəʊˈtrɒpɪks/ /ˌpeɪlɪəʊˈtrɒpɪks/noun
The tropical and subtropical parts of the Old World; specifically the palaeotropical zoogeographical region or phytogeographical realm.
Origin
1920s; earliest use found in Quarterly Review of Biology. From palaeo- + the plural of tropic.